/* Copyright 2006-2007 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.grails.plugins.acegi;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.groovy.grails.commons.GrailsApplication;
import org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext;
import org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate3.SessionFactoryUtils;
import org.springframework.orm.hibernate3.SessionHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;
import org.springframework.web.context.support.WebApplicationObjectSupport;

/**
 * Grails Web Application Object Support
 *
 * @author T.Yamamoto
 */
public abstract class GrailsWebApplicationObjectSupport extends WebApplicationObjectSupport {

    private static final Log logger = LogFactory.getLog(GrailsWebApplicationObjectSupport.class);
    protected SessionFactory sessionFactory;
    protected Session session;
    private boolean containerManagedSession = false;

    /**
     * Returns GrailsApplication from context
     *
     * @return GrailsApplication
     */
    public GrailsApplication getGrailsApplication() {
        GrailsWebApplicationContext context =
                (GrailsWebApplicationContext) getServletContext()
                        .getAttribute(GrailsApplicationAttributes.APPLICATION_CONTEXT);
        GrailsApplication grailsApplication =
                (GrailsApplication) context.getBean(GrailsApplication.APPLICATION_ID);
        logger.debug("" + grailsApplication);

        return grailsApplication;
    }

    /**
     * set up hibernate session
     */
    protected void setUpSession() {
        try {
            sessionFactory = (SessionFactory) getWebApplicationContext().getBean("sessionFactory");

            if (TransactionSynchronizationManager.hasResource(sessionFactory)) {
                if (logger.isDebugEnabled()) logger.debug("Session already has transaction attached");
                containerManagedSession = true;
                this.session = ((SessionHolder) TransactionSynchronizationManager.getResource(sessionFactory)).getSession();
            } else {
                if (logger.isDebugEnabled())
                    logger.debug("Session does not have transaction attached... Creating new one");
                containerManagedSession = false;
                session = SessionFactoryUtils.getSession(sessionFactory, true);
                SessionHolder sessionHolder = new SessionHolder(session);
                TransactionSynchronizationManager.bindResource(sessionFactory, sessionHolder);
            }

        } catch (Exception e) {
            logger.error(e.getMessage());
            e.printStackTrace();
        }
    }

    /**
     * Release Session
     */
    protected void releaseSession() {
        if (!containerManagedSession) {
            SessionHolder sessionHolder = (SessionHolder) TransactionSynchronizationManager.unbindResource(sessionFactory);
            SessionFactoryUtils.releaseSession(sessionHolder.getSession(), sessionFactory);
            logger.debug("Session released");
        }
    }

}
